Paper-box shell



H. B. SMITH.

PAPER BOX SHELL.

APPLICATIO FILED JAN-24, 1919. RENEWED DEC. 1,1920- Patented Jan. 11, 1921.

metres STATES Mam FFICE.

PAPER-BOX SHELL.

Specification of Letters Patent.

Patented Jan. 11, 1921.

Application filed January 24-, 1919, Serial No. 272,997. Renewed December 1, 1920. Serial No. 427,655.

7 '0 all whom it may concern:

Be it known that I, HARRY Bruno-MAN SMITH a citizen of the United States, residing at l rooklyn, in the county of Kings and State of New York, have invented new and useful Improvements in Paper-Box Shells, of which the following is a specification.

This invention relates to improvements in paper box construction, pertainingmore particularly to structures in which the cover blank is applied in what is generally known in the trade as a loose wrap formation.

Box construction of this type, as generally produced, has been alon the lines disclosed in the patent to P. S. smitlnNo. 912,74i6, February 16, 1909, wherein the cover blank is applied to a set-up shell, the blank being applied in such manner as to produce this loose wrap effect, viz. a non-adhesive connection of the blank to the outer faces of the shell, the adhesive connection being applied along the marginal edges of the covering blank which, in the finished product, are infolded on to the interior faces of the up standing walls of the shell.

Certain difliculties are present in such construction, among which are those produced by the bunching of marginal edge portions at the corners during the inturning of the edges, difficulties which have been overcome to a certain extent by the use of certain mechanisms.

T have found, however, that these and other difiiculties can be avoided to .a considerable extent by assembling the shell and cover blanks in the flat-in advance of any setting-up of the shell blank, this possibility being presented in companion applications.

Where, however, the assembly is in the flat,"

and especially where the shell blank is of a type to provide multi-ply end wall con figurations in the set-up shell, the manner in which the side and end wings and laps of the shell blank are requiredto be folded present other problems where the construction is being utilized under quantity production conditions. One of these problems is provided by the fact that the end wall configuration is v of more than one ply while the assembly in the fiatprovided by inturning the marginal edges of the side wings of the cover blank and adhesively connecting them to the opposite face of the shell blankwould include but a single ply within the marginal edge overlying the side wing laps, the result being that in the set up condition the marginal edge of the upstanding end wings-the inner ply of the end wall of the shellwould be exposed excepting at such portion as would be covered by the end wing of the cover blank which is applied after the shell has been set up; as the applied end wing of the cover blank does not extend the full width of the shell-the length of the end wallsan exposed or raw edge would be" presented on opposite sides of the applied end wing, materially affecting the general appearance of the finished box shell.

This particular problem is met in a companion application by retaining a portion of the sine wing marginal edges of the cover blank unapplied until after the shell blank end configuration is in set up formation, permitting the application to be made to the.

double ply thickness. This, however, practically requires slitting of the cover blank at proper points to enable a portion of the marginal edge to be applied in the flatwhile these portions remain unapplied, thus tending to add to the cost of manufacture in this respect.

The present invention is designed to meet this general problem in a different manner, retaining the advantages of an assembly in the flat and at the same time eliminating the necessity of slitting the cover blank. This result is obtained by changing the form of the shell blank in certain respectsa change which does not affect the ability to produce it in the usual manner-and applying the marginal edges of the cover blank side wings throughout the 'lengtho'f the marginal edges. and while both blanks are in the flat. The particular change in shell blank is the cutting away of a small section at the 9 outer corners of the end wings of the shell blankthe portion of the wings .which would normally fall beneath the slittedportions of the companion application. The vertical length of the cut-away portion may vary, but should not extend the entire depth of the box shell; and the horizontal length is preferably, although not essentially, sumcient to carry the vertical wall of the recess into underlying relation to the applied end wing of the cover blank. The omission of the sections obviously carry the margin of the shell end wings on practically two planes, the portion covered by the cover blank end wing extending to the top-plane of the shell, while those portions not covered extend to a plane below and spaced from such top plane.

As a result, the upper margin of the shell end wings in the plane of the top of the shell presents the finished edge-covered appearance, since the shell side wing laps.wh i,ch. extend to such plane and form the outer ply of the end configuration-receive their cov-. ering while the blanks are in the flat. When the shell is filled, the raw edge producedi by the horizontal wall of the cutaway portion is below the level of the contents and there.- fore unnoticed; when the contents are removed, the appearance is not materiallyaffected, since the raw edge tends. to give the appearance of an inserted member at the ends of the shell.

To these and other ends, therefore, said invention consists in the improved construe tion and combination of parts hereinafter fully described, illustrated in the accompanying drawings and more particularly pointed out in the appended claims.

In the accompanying drawings, in which similar reference characters. indicate similar parts in each of the views,

Figure 1 is a perspective view showing an assembly ofthe cover and shell blanksinthe flat, the view also showing, in dotted line outline, the particular shape of' the shellblank employed in the assembly.

Figs. 2, 3 and a are perspective detail views showing progressive stages in the folding of the assembly of Fig. 1'.

Fig. 5 is a detail sectional view of-fthe. folded assembly, the section beingtaken through the end wall. formation.

Fig. 6 is a perspective view of; a completed shell.

For the purpose of illustrating the invention, simple forms of blanks are shown, these being illustrative of a general: type which may be varied to meet individual needs or service conditions. The illnstra tion is of blanks adapted to produce a shell in which the end-wallsare of the multi-ply' formation with the end wing of the shell: blanl forming the inner ply.

The shell blank, indicated'generally at-A, is of the usual general form, modifiedin certain respects, the blank having the bodyportion a, side wings a, end wings a and laps a at the ends of the sidewings. The blank may be scored, if desired, the scoring beingindicated by the dot and dash lines. The modification of the general form of the blank consists in changing the outer edge configuration of the end walls by cutting away or omitting sections at the opposite ends of these wings, this omissionbeing indicated at a", and shown as of rectangular contour, with the dimensions such as to 10- cate the horizontal wall or edge on a different or lower plane than the normal edge when the wing isin its upstanding position, and the vertical wall located at a point where it may underlie the infolded end wing of the cover blank.

The cover blank, indicated at B, is also of a general formation, carrying a body portion b end wings 1), side wings b and what may be considered as wing laps 6 these latter being the extended portions of the side Wings. The wings and laps of the coverblank are of greater width than the width of the similar parts of the shell blank to provide margins, these margins preferably carrying adhesive zones. Theparts of the cover blank do not; conform in dimensions with the similar parts of the shell blank, this being one of the general characteristics of structures fornied 'under loose-wrap conditions.

As heretofore pointed out, one general differenceover the prior practice of applyingthe cover blank, is that I assemble the two blanks while in. the flat/f the shell blank beingplaced! in proper position on thecover blank, after-whichthemargins of the si'dewings Z) and their laps are turned overthe marginal: edges of and. adhesively secured tothel upper faces ofside wings a and? their laps a as-shown in Fig. 1'.

This provides the embryo assembly, in Which theappli'cation of the cover blank is completed so far as the side; of the shell blank is concerned, this inturni'ng of margins also applyingthe major cover to the upper edge of the laps M3.

End wingsa of theshell blankare then raised to upstanding position, as in Fig. 2, followed by raising; of side. wings a, this latter raising placingv laps of in position wherethey can be folded inward upon the upstanding end wings, as in- Fig. 3, so that the inturned marginal portions 0 of" the cover willlie betweenadjacent faces of laps and end win-gs a Sincethe-margins of the laps of are, covered, this folding brings the cover blank into position wherethe end wings b can be given the usual doubled or gusset fold formation, as shown in this figure, this formation then being raised as in Fig. 4, and-the margin 6 inturned over the end wall edges; and infold'ed into securing relation onto the inner face of wings 03, as. in, Fig. 6', this inturning placing-n portion. ofthe Wing mar-gins inoverlying relation to thepreviously covered edges of laps a and; with, a-- blank having the cutaway dimensi'onsindicated, concealing the .vertioal' edges-of the cut-away portions, proil ucingi the general appearance indicated in As Will be understood, the horizontal edges of the. cut away section remain uncovered, but-being ona lower plane than the topof the shell, the raw edge'does not detract from; the general appearance of the finished shell since it is not brought into direct comparison with the covered ec go of laps (L LS would be the case if the sections a were retained; and when the-shell is filled, this exposed raw edge is generally located below the filling level and therefore concealed, so that the finished appearance of the shell is maintained. And where the blanks are properly proportioned, this general formation may add to the attractiveness of the empty shell, in that it gives the appearance of the presence of an inserted member within the shell, seemingly strengthening the latter.

As will be understood, this change from prior practice is of exceeding importance from a manufacturing standpoint. It permits of assembly of the blanks in the flat, thus eliminating the difiiculties relative to bunching at the corners where infolding attempted with the cover blank application to a set-up shell. It permits of the applica tion of the margin to the shell laps as a part of the assembly-incldentally eliminating the necessity of slitting the cover blank and the difficulties incident theretowithout bringing about a set-up condition which would detract from the finished appearance-such as would be provided by leaving a raw edge exposed side by side and in the same plane with a covered edge of the end wall formation. It requires only the manipulation of the end-wing margins of the cover blank when dealing with the set up shell, a simple operation in connection with standard machines.

As a result, the completed shell is produced in a materially simpler manner without detracting from the appearance of the product, thereby materially reducing the general cost of manufacture, a matter of vital importance in production and commercial conditions.

While I have herein disclosed one way in which the invention may be embodied, it will be readily understood that changes or modifications therein may be found essential or desirable in meeting the exigencies of use, and I desire to be understood as reserving the right to make any and all such changes as may be found desirable or necessary, in so far as the same may fall within the spirit and scope of the invention as expressed in the accompanying claims, when broadly construed.

As will be readily seen, practice of the in vention greatly decreases the cost of manufacture through simplifying the methods employed in assembling the blanks and setting up the assembly into the completed product, this result being obtained by so assembling the blanks that portions of the side wing marginal edges will be located between the planes of adjacent plies of the multi-ply end wall formations of the setup shell. It is to be understood therefore, that the invention is not limited to' the particular shape of blanks or the product resulting, but includes the method of producing the product.

Having thus described my invention, what l. claim new is 1. it covered paper box shell of the loosewrap type, comprising a shell blank foldable to produce a multi-ply end Wall formation, and a covering blank applied thereto, said blanks being assembled to. provide a shell structure having those edges of its upstanding wells located in the plane of the open top of the shell covered, and having additional edges of such wells located intermediate said plane and the bottom plane of the shell.

2. A covered paper box shell of the loosewrap type, comprising a shell blank foldable to produce a multi-ply end wall formation, and acover blank applied thereto, said blanks being assembled to provide a shell structure having those edges of its upstanding walls located in the plane of the open top of the shell covered, and having additional edges of such walls located intermediate said plane and the bottom .plane of the shell and exposed on the interior of the shell.

8. it covered paper box shell of the loose wrap type, comprising a shell blank having wings and end laps foldable to produce a n'iulti-ply end wall formation, and a cover blank applied thereto with marginal portions overlying and adhesively aflixed to marginal edges of the wings and laps, saidblanks being folded to provide a shell structure having covered portions of the laps lying between adjacent plies.

l. A covered paper box shell comprising a shell blank having end Wings and side wings with end laps foldable to produce a multi-ply end wall formation, and a cover blank applied exteriorly of the shell blank with marginal portions overlying and adhesively aihxed to marginal edges of said side wings and end laps, said blanks being assembled in the flat and folded to provide a shell structure,having covered portions of the laps lying between adjacent faces of the wall plies, and said cover blank having gusset folds at the ends of the shell with marginal portions turned over the edges of the multi-ply walls and adhesively affixed to the interior of the shell.

5. A covered box shell comprising a shell blank foldable to produce a multi-ply end wall formation and having its end wings recessed at opposite ends with the re cesses extending inward from the plane of the marginal edge of the wings, and a cover blank applied to overlie the marginal edges of the upstanding walls of the shell blank in the plane of the open top of the shell.

box shell comprising a shell slde and end wings and laps u nstandlngpositions to prolg th laps and end wings, and a cover 1 thei to With marginal edges 1 al edges of the shell blank laps and with end Wings 'nai edges of the upstanding ation, the shell blank end V recessed inwardly in advance of the edge-covered pertions of the shell blank laps.

end-Wall formation em- 7. A shell blank adapted for use in the ferination of covered" paper box shells of the lnulti-ply end Wall type, said blank comprising a body portion, side and: end Wings, and laps at opposite ends of and integral with the side Wings, said end Wings being 1'e cessed inwardly at opposite ends of the Wing outer edge to provide an edge contour extendingin a plurality of planes.

In testimony whereof I have hereunto set my hand.

HARRY BRIDGMAN SMITH. 

